Dev with Riko (@devwithriko)

What does one request look like? What does one request look like? Save this and try it yourself. #dev #WhatIsServer #learntocode #fyp

What is localhost? What is localhost? Save this and try it yourself. #dev #WhatIsServer #learntocode #fyp

How big must a server be? How big must a server be? Save this and try it yourself. #dev #WhatIsServer #learntocode #fyp

API or endpoint, same thing? API or endpoint, same thing? Save this and try it yourself. #dev #WhatIsServer #learntocode #fyp

Escaping tutorial hell. Escaping tutorial hell. Save this and try it yourself. #dev #LearningHowToLearn #learntocode #fyp

Forgetting is a feature. Forgetting is a feature. Save this and try it yourself. #dev #LearningHowToLearn #learntocode #fyp

The Feynman technique. The Feynman technique. Save this and try it yourself. #dev #LearningHowToLearn #learntocode #fyp

A.I. A.I. Save this and try it yourself. #dev #LearningHowToLearn #learntocode #fyp

The most expensive AI bug is an unbounded loop Prompt injection is number one on OWASP's LLM top 10 — user input is untrusted. Four cost moves: cheap model, cache repeats, cap tokens, rate-limit users. Follow for the full course #aisecurity #ai #devtok #techtok

RAG is an open-book exam for AI Chunks get embedded into vectors; your question becomes a vector too. The most similar chunks go into the prompt — the model answers from what's in front of it. Follow for the full course #rag #ai #aitools #techtok

An agent is a model in a loop with tools Each turn: plan, call a tool, observe the result, continue until done. Cap iterations at 5-10 — a confused agent repeats the same call, burning tokens. Follow for the full course #aiagents #ai #aitools #techtok

An AI assistant is an intern that never sleeps It drafts, you drive, you approve. Context is the fuel — related files in, random tabs out. It replaces typing, not thinking. Deciding what to build is still the job. Follow for the full course #ai #coding #devtok #techtok

Free text is for humans. Code needs a shape. Hand the model a JSON schema — it must answer inside it. Generate, validate, retry with the error attached. Two retries catch almost everything. Follow for the full course #json #ai #aitools #devtok

Your first AI API call is just HTTPS Post a messages array, get generated text back. Roles steer: system, user, assistant. Keys stay server-side — a key in frontend code is public the second you deploy. Follow for the full course #ai #api #devtok #programming

How to talk to robots professionally Be specific about the output, show an example, give a role, iterate on the result. A good prompt is a small document — instruction, examples, then the ask. Follow for the full course #promptengineering #ai #aitools #techtok

An LLM does exactly one thing Predict the next token. Append it. Run the whole thing again. It predicts, not knows — confident and wrong is possible, so verify anything important. Follow for the full course #ai #llm #aitools #techtok

Production servers have no desktop You get SSH, a shell, and about 12 commands — that's the whole job. Everything is a file, so small tools compose through pipes. Follow for the full course #linux #terminal #techtok #programming

An untested backup is not a backup pg_dump to a file, with copies on another machine. A backup on the same server dies with the server. Follow for the full course #postgres #database #coding #techtok

Know it broke before your users do Logs are events, metrics are numbers, traces follow one request. JSON logs with a request ID: one query answers who was affected. Follow for the full course #observability #monitoring #devtok #techtok

Did I break prod? The robot says no. Every push gets tested — a red build never reaches production. A five-minute pipeline gets watched, a 40-minute one gets ignored. Follow for the full course #cicd #devops #learntocode #devtok

One file. One command. Your whole stack. Your API reaches Postgres at hostname db, no IPs needed. depends_on waits for start, not readiness — use condition: service_healthy. Follow for the full course #dockercompose #backend #devtok #coding

One sealed box. Runs identically everywhere. One image, many containers. Cached layers mean only the copy line rebuilds. State goes in volumes, or a rebuild wipes your database. Follow for the full course #docker #containers #techtok #coding

Bots knock on port 22 all night SSH keys and fail2ban mean they waste their time. Also, nginx is pronounced engine-X. Follow for the full course #vps #linux #techtok #learntocode

Localhost is not a deployment Nginx terminates TLS and routes to your app on a private port. systemd restarts crashes and boots with the machine. Follow for the full course #backend #nginx #devtok #techtok

HTTP asks. WebSockets never hang up. One upgrade header, and the socket becomes a two-way pipe. A broadcast is just a loop to every open socket. Follow for the full course #websockets #realtime #coding #devtok

React, but the boring 80% is handled app/about becomes /about, a bracketed folder becomes /users/42. Server rendering by default, so you ship less JavaScript. Follow for the full course #nextjs #webdevelopment #programming #techtok

Same web code, megabytes instead of gigabytes ⚡ Tauri uses the WebView your OS already ships — Electron bundles Chromium. A Rust backend called straight from JavaScript, no HTTP server. Follow for the full course #tauri #rustlang #learntocode #devtok

App rejected? It's a queue, not a verdict. Crash on launch, missing privacy disclosures, broken links. Fix it, bump the build number, resubmit. Follow for the full course #appstore #googleplay #coding #techtok

One screen is a sad website Tabs switch sections, stacks push detail screens on top. Flip one auth flag and React swaps the whole tree. Follow for the full course #reactnavigation #reactnative #coding #learntocode

Your React code just became a real native app 📱 Not a webview — View maps to UIView on iOS, Android.View on Android. Instagram, Discord and Shopify ship with it. Follow for the full course #reactnative #mobiledev #devtok #techtok